挤压AZ63镁牺牲阳极的组织和电化学性能  

Microstructure and Electrochemical Properties of Extruded AZ63 Magnesium Sacrificial Anode

作　　者：张秋美[1] 吴锐 

机构地区：[1]陕西理工学院材料科学与工程学院,陕西汉中723003 [2]中航飞机汉中飞机分公司机加钳焊厂313H工艺室,陕西汉中723200

出　　处：《材料保护》2016年第6期76-79,8,共4页Materials Protection

基　　金：陕西省科技厅科技基金资助项目(2011JE009);陕西省教育厅科技基金资助项目(12JS034);陕西理工学院科技基金资助项目(Slgky13-34)

摘　　要：为了给挤压AZ63镁阳极的工程应用提供理论参考,研究了挤压温度对挤压AZ63镁阳极组织特征和电化学性能的影响,并与铸态AZ63镁阳极的组织特征和电化学性能进行对比分析。结果表明:当挤压温度较低时,晶内偏析形成的Mg_(17)Al_(12)相不均匀地残留在晶界上,且再结晶程度较低,使镁阳极产生严重的不均匀自腐蚀,降低其电化学性能;提高挤压温度能够使Mg_(17)Al_(12)相在晶界几乎消失,并提高再结晶程度,使阳极的电化学性能相对于铸态镁阳极显著提高;铸态AZ63镁阳极中的Mg_(17)Al_(12)相在晶界呈现出接近连续网状分布,体积分数较大,晶粒粗大。Effect of extrusion temperature on microstructure and electrochemical properties of AZ63 magnesium sacrificial anode was investigated,and the related comparison studies on microstructure characterization and electrochemical properties were carried out between the extruded magnesium anodes and as-cast magnesium anode.Results showed that when the extrusion temperature was much low,the formed Mg_(17)Al_(12) phase owing to micro- segregation remained inhomogeneously on the grain boundaries and the re- crystallization ratio was much lower,leading to severe localized self-corrosion of the extruded magnesium anode.However,improving the extrusion temperature,all Mg_(17)Al_(12) phases nearly disappeared on the grain boundaries and the re- crystallization ratio was also increased greatly,leading to significant increase of the electro- chemical properties of the extruded magnesium anode,compared with the as-cast magnesium anode.Mg_(17)Al_(12) phases in the as-cast AZ63 magnesium anodes distributed in the shape of continuous net and the coarse grains were easily observed.

关 键 词：挤压温度 挤压AZ63镁牺牲阳极 组织 电化学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG174.41[金属学及工艺—金属材料]